如何在文本中获取占位符？

I have a variable with a small text like:

$s = "bla bla bla {name} bla bla bla bla bla bla {city} bla bla bla {address}";

I need to use a regular expression to get ALL the name inside { }

In this case I need an array as result with:

• "name"
• "city"
• "address"

How to use preg_match to get all the texts inside the brackets ?

Thanks

This works for me:

$s = "bla bla bla {name} bla bla bla bla bla bla {city} bla bla bla {address}";
preg_match_all("/\{([^\}]+)\}/i", $s, $matches);
$results = $matches[1];